var Pic = new Array()
Pic[0] = '/images/v2/TopImage1.jpg'
Pic[1] = '/images/v2/TopImage2.jpg'
Pic[2] = '/images/v2/TopImage3.jpg'
Pic[3] = '/images/v2/TopImage4.jpg'

var t
var j = 0
var p = Pic.length

var preLoad = new Array()
for (i = 0; i < p; i++){
   preLoad[i] = new Image()
   preLoad[i].src = Pic[i]
}

function displayBanner(){
      setTimeout('changeBanner()', 5000);
}

function changeBanner(){

   j = Math.floor(Pic.length*Math.random());

   if (document.getElementById("topbanner")!=null){
      document.getElementById("topbanner").style.background = 'url(' + Pic[j] + ')';
      setTimeout('changeBanner()', 5000);
   }
}